Low Vacuum Degree or No Vacuum Degree

1.Vacuum system issues: Vacuum pump malfunction, insufficient capacity, clogged steam-water separator, or excessively high liquid level.

2.Pipeline leakage: Leakage at vacuum pipelines, valves, or joints.

3.Filter disc seal failure: Wear of friction plates between the filter disc and distributor head, wear of the distributor head, or insufficient spring pressure.

4.Filter cloth damage: Holes in the filter cloth, causing a large amount of air to be sucked in through the holes.

5.Excessively low slurry level: The filter disc is not immersed in the slurry, resulting in air being sucked in.

1.Overhaul the vacuum pump; clean the steam-water separator and maintain the normal liquid level.

2.Perform pressure retention and leak detection on the vacuum pipeline, fasten the joints, and replace damaged valves or pipe sections.

3.Shut down the equipment to replace the worn friction plates and distributor head liners, and adjust or replace the springs.

4.Shut down the equipment and replace the damaged filter cloth.

5.Adjust the feed rate or equipment speed to ensure the immersion depth of the filter disc in the slurry suction area meets the standard.

Significant Fluctuations in Vacuum Degree

1.Abnormal filter cloth condition: Partial clogging or damage of the filter cloth leads to unstable air suction volume.

2.Slurry concentration fluctuation: Significant variations in the feed concentration result in uneven filter cake thickness and large differences in air permeability.

3.Air leakage in the distributor head: Wear of the internal partition plate in the distributor head causes air leakage between zones such as the drying zone and the slurry suction zone.

1.Clean or replace the filter cloths uniformly to ensure their consistent condition.

2.Optimize the preceding processes to maintain stable feed concentration.

3.Overhaul the distributor head and replace internally worn components.

Difficulty in Filter Cake Formation or Excessively Thin Filter Cake

1. Insufficient vacuum degree: The causes are the same as above.  

2. Poor adaptability/clogging of the filter cloth: If the pore size is too small or clogged, the initial filtration resistance will be high; if the pore size is too large, particles will easily penetrate.  

3. Poor slurry properties: Too fine particles, high viscosity, and low concentration.  

4. Inadequate slurry suction by the filter disc: Excessively high equipment rotation speed results in insufficient immersion depth or slurry suction time.

1.Improve the vacuum degree: Increase the vacuum degree according to the aforementioned methods.

2.Re-select the filter cloth based on the material properties, or thoroughly clean and replace it; filter aid can be added as appropriate.

3.Increase the slurry concentration; add flocculant to promote the agglomeration of fine particles.

4.Reduce the rotation speed appropriately to ensure sufficient slurry suction.

High Moisture Content in Filter Cake

1.Insufficient vacuum degree/insufficient time: Insufficient vacuum suction in the drying zone, or excessively short filter cake drying time.

2.Poor air permeability of the filter cloth: Clogging or improper selection of the filter cloth makes it difficult to extract moisture.

3.Cracking of the filter cake: Vacuum suction causes the filter cake to crack, and air is short-circuited through the cracks, reducing drying efficiency.

4.Strong water retention of materials: Materials such as colloids have strong inherent water-holding capacity.

1.Ensure the vacuum degree meets the standard; if necessary, reduce the rotation speed to extend the drying time.

2.Clean or replace the filter cloth.

3.Increase the dosage of flocculant to improve the compressibility and toughness of the filter cake.

4.If the equipment supports it, additional steam heating or compressed air purging systems can be installed.

Difficulty in Filter Cake Discharge (Low Discharge Rate)

1.Abnormal backblowing system: Improper setting of backblowing pressure or timing, or pipeline leakage.

2.Poor scraper condition: Scraper wear, deformation, or improper installation angle/distance.

3.Material adhesion on filter cloth: Incomplete cleaning of the filter cloth, resulting in the "dead zone" phenomenon where materials adhere.

4.Abnormal filter cake properties: Filter cake is excessively sticky or thin.

1.Check the system status, adjust the backblowing pressure and timing to ensure effective operation in the discharge zone.

2.Adjust, repair or replace the scraper to ensure a reasonable gap between the scraper and the filter cloth.

3.Enhance the flushing intensity; high-pressure water or chemical cleaning agents can also be used for online/offline cleaning.

4.Improve the filter cake properties from the source to ensure the filter cake thickness meets the standard.

Abnormal Vibration/Noise of the Main Shaft or Bearing

1.Bearing damage: Wear caused by long-term operation or poor lubrication.

2.Unbalanced load on the filter disc: Uneven force due to excessively thick filter cake on one side or foreign matter jamming.

3.Abnormal main shaft: Bending of the main shaft or misalignment during installation.

1.Shut down the machine to replace the bearing and establish a regular lubrication system.

2.Remove foreign matter and adjust the feed distribution to balance the load.

3.Calibrate the main shaft and replace it directly if necessary.

Abnormal Wear of the Distribution Head

1.Wear of friction plates: Normal wear and tear, requiring regular replacement.

2.Lubrication failure: Malfunction of the distribution head's lubrication system.

3.Foreign matter intrusion: Hard particles in the slurry enter the friction pair.

1.Include friction plates/lining plates in the management of vulnerable parts requiring regular replacement.

2.Ensure the normal operation of the distribution head's lubrication system.

3.Check the integrity of the filter cloth to prevent the leakage of hard particles.

Green Leaf Turbidity

1.Filter cloth damage: Holes appear in the filter cloth.

2.Improper filter cloth selection: The pore size is too large to effectively retain fine particles.

3.Filter cloth seal failure: The filter cloth is not tightened or the sealing strip is aged, resulting in slurry short-circuiting.

4.Failure to form the initial filter cake layer: During the initial stage of filtration, fine particles directly penetrate the filter cloth.

1.Directly replace the filter cloth with holes.

2.Replace it with a filter cloth that has better surface filtration performance, such as a denser one or a membrane-coated one.

3.Retension the filter cloth and replace the aged sealing strips.

4.During the initial feeding stage, the flow rate can be reduced, or a filter aid can be added for pre-coating.